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If a device is already a macvlan port then refuse to use it as an ipvlan port in the early stage of port creation. thost1:~# ip link add link eth0 mvl0 type macvlan thost1:~# echo $? 0 thost1:~# ip link add link eth0 ipvl0 type ipvlan RTNETLINK answers: Device or resource busy thost1:~# echo $? 2 thost1:~# Signed-off-by: Mahesh Bandewar <maheshb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>